And what efficiency are they at now? Must be really terrible. University press release doesn't say, and article is paywalled (for science!). Maybe at the scale

And what efficiency are they at now? Must be really terrible. University press release doesn't say, and article is paywalled (for science!). Maybe at the scale they're currently at they don't even know. Good luck to them getting it higher; thin film silicon can get up to 20% cell efficiency, and should eventually be pretty cheap, so they'll have to get it reasonably efficient to be useful.